Regex Tester Guides

Free online tools for developers and everyday life. JSON/XML formatter, BMI calculator, loan calculator, unit converter, world time, and more.

Regex Basics: A Beginner-Friendly Introduction

Learn regular expressions from scratch. This beginner-friendly guide covers basic syntax, character classes, quantifiers, anchors, and practical examples to get you started.

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20 Common Regex Patterns Every Developer Should Know

A curated collection of the most useful regular expression patterns for everyday development. Includes email validation, URL matching, phone numbers, IP addresses, and more with detailed explanations.

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Regular Expression Flags Explained: g, i, m, s, u, y

A complete guide to JavaScript regular expression flags. Learn what each flag does, when to use them, how to combine them, and see practical examples for g, i, m, s, u, and y.

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